JP4456610B2 - Sanitary tissue paper - Google Patents

Description

  The present invention relates to sanitary thin paper used in kitchens such as kitchen paper, cooking paper, and kitchen towels, and sanitary thin paper such as sanitary thin paper used for wiping off dust and chemicals in tests and experiments.

Among these types of sanitary tissue paper, for example, sanitary tissue paper such as kitchen paper used in the kitchen is wiped off moisture and oil on ingredients and tableware, scattered seasonings are wiped off, excess oil in fried foods is absorbed, Used for oil strainers. Therefore, it is required to absorb moisture and oil quickly and to have a large amount of retention. In addition, since this type of sanitary thin paper is also used for draining soft ingredients such as tofu and vegetables, wiping away complex shaped dishes and kitchens, softness is also regarded as important. Furthermore, this type of sanitary thin paper is also regarded as important in that the generation of paper dust (lint) is small so that paper dust does not adhere to foods and the like. In particular, the fact that the occurrence of lint is small increases in importance in sanitary thin paper used in tests, experiments, and the like.
As a sanitary thin paper requiring various performances as described above, a proposal of a nonwoven fabric provided with a fiber layer on one side or both sides of a film-like layer is helpful (see, for example, Patent Document 1). However, since this nonwoven fabric is not intended for sanitary thin paper, generation of lint is not solved. Moreover, since it has a film-like layer, it lacks softness.
As this type of sanitary thin paper, a cooking paper having a fiber web layer in which the fiber thickness, fiber length, fiber type, fiber blending ratio, etc. are specified on both sides of the pulp layer has been proposed ( For example, see Patent Document 2.) However, even if the physical properties of the constituent fibers are simply specified in this way, it is difficult to maintain softness while reducing the occurrence of lint.
Furthermore, as this type of sanitary thin paper, there has been proposed a cleaning sheet in which a fiber web is locally compressed to form a region having a high fiber density and a region having a low fiber density (see, for example, Patent Document 3). ). However, if the dust is simply locally compressed in this way, the occurrence of lint is not limited, even though dust collection is improved. In addition, the softness is impaired depending on the compression range, the compression rate, and the like.
Moreover, as this type of sanitary thin paper, a wiping sheet is proposed that includes a flat sheet and an embossed sheet, and each convex part on the back side of the embossed sheet is bonded to the flat sheet (for example, Patent Document 4). reference.). In this wiping sheet, each convex portion on the embossed sheet surface side is a wrinkle imparting convex portion in which a hollow shape is crushed. However, since this form is obtained by bonding each convex part on the back side of the embossed sheet and the flat sheet, even though dust collection is improved, the unity between the layers is remarkably weak, The occurrence of lint does not decrease.
JP 2001-136619 A JP 2005-34617 A JP 2002-369882 A JP 2006-305175 A

  The main problem to be solved by the present invention is to provide a sanitary thin paper that has the necessary water absorbency and oil absorbency with less lint generation, excellent softness, and strong inter-layer integrity. .

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
An intermediate layer containing heat-fusible fibers, one outer layer mixed with heat-fusible fibers containing chemical fibers and pulp, and the other outer layer,
Thermocompression bonding is performed by the deep embossing group from the one outer layer side and the shallow embossing group between them,
The one outer layer is
A sanitary thin paper characterized in that a surface embossing group is formed which is joined to the intermediate layer in a state of being bitten into the intermediate layer by the deep embossing group and does not reach the intermediate layer by the shallow embossing group. .

(Main effects)
"Water absorption and oil absorption"
○ The sanitary thin paper of the present invention is excellent in water absorption and oil absorption because one outer layer contains chemical fibers and pulp.
The sanitary thin paper of the present invention has a laminated structure composed of an intermediate layer, one outer layer, and the other outer layer, so it becomes bulky and is excellent in water absorption and oil absorption per unit area.
"Lint occurrence"
O Since the sanitary thin paper of the present invention is mixed with heat-fusible fibers in addition to chemical fibers and pulp in one outer layer, the occurrence of lint is small.
○ The sanitary thin paper of the present invention has a surface embossing group in which one outer layer is mixed with heat-fusible fibers and does not reach the intermediate layer by a shallow embossing group. Is much less.
“Integrity between layers”
○ When sanitary thin paper has a laminated structure, the layers can be integrated by the airlaid method or mechanical entanglement method (spun lace method). However, according to these methods, the rigidity of the sanitary thin paper may be excessively increased (decrease in softness) or the integrity may be insufficient. In particular, when any layer contains pulp, the integrity tends to be further insufficient. On the other hand, the sanitary thin paper of the present invention includes the intermediate layer and one outer layer containing heat-fusible fibers, and thermocompression bonding. In addition, one outer layer is partially formed by a deep embossing group. Therefore, there is no possibility that the rigidity is excessively increased or the integrity is insufficient.
In the case where the intermediate layer and one outer layer include heat-fusible fibers and are integrated only by thermocompression bonding, it is necessary to apply a certain amount of strong pressure, so that rigidity is likely to increase. In addition, when only one outer layer is integrated into the middle layer by a deep embossing group, the integration tends to be insufficient if the number of deep embossing groups is small, and the deep embossing group If the number is large, the rigidity is likely to increase. Furthermore, since the voids are reduced by the deep embossing group and the liquid absorbency is lowered, it is not preferable to increase the number.
"safety"
○ When chemical paper and pulp are mixed, they are generally bonded by an adhesive because they do not hydrogen bond. However, since sanitary thin paper may be used in contact with food or the like, for example, the use of an adhesive is not desirable. On the other hand, the sanitary thin paper of the present invention does not have such a problem because it is bonded by the heat-fusible fiber.
○ When the sanitary thin paper has a laminated structure, the layers can be integrated by an adhesive. However, as mentioned above, the use of an adhesive is not desirable. On the other hand, the sanitary thin paper of the present invention does not have such a problem because it is not based on an adhesive as described above.

[Invention of Claim 2]
An intermediate layer containing heat-fusible fibers, one outer layer containing chemical fibers and pulp and mixed with heat-fusible fibers, and another outer layer mixed with heat-fusible fibers containing chemical fibers and pulp Have
Thermocompression bonding is performed by a deep embossing group and a shallow embossing group between them from both outer layer sides,
Both outer layers are
A sanitary thin paper characterized in that a surface embossed group is formed which is joined to the intermediate layer in a state of being bitten into the intermediate layer by the deep embossed group and does not reach the intermediate layer by the shallow embossed group. .

(Main effects)
The sanitary thin paper of the present invention exhibits the same effect as that of the invention of claim 1 for the other outer layer, and can therefore be used regardless of the front and back sides.

[Invention of Claim 3]
The sanitary thin paper according to claim 2, wherein the positions of the deep embossed groups coincide between the two outer layers.

(Main effects)
The sanitary thin paper of the present invention is excellent in the mutual integrity of the layers on the entire surface of the sanitary thin paper because the integrity of the layers is excellent in the matching deep embossed group.

[Invention of Claim 4]
Wherein both outer layers, the pulp comprises 30 to 80 wt%, and grammage (JIS P 8124: 1998) is 10 to 40 g / m ^2, claim 2 or claim 3, wherein the sanitary thin paper.

(Main effects)
This effect will be described later.

[Invention of Claim 5]
The total basis weight (JIS P 8124: 1998) of the intermediate layer and both outer layers is 40 to 180 g / m ² ,
And the sanitary thin paper of any one of Claims 2-4 compressed 50-90% in the said deep embossing group part, and compressed 10-30% in the said shallow embossing group part.

(Main effects)
This effect will be described later.

[Invention of Claim 6]
The area ratio of the deep embossing group portion is 5 to 25%, the area ratio of the shallow embossing group portion is 5 to 25%, the area of the deep embossing group portion / the area of the shallow embossing group portion is 0.3 to 1. The sanitary thin paper according to any one of claims 2 to 5, which is 2.

(Main effects)
This effect will be described later.

  According to the present invention, the sanitary thin paper has the required water absorbency and oil absorbency with little lint generation, excellent softness, and strong inter-layer integrity.

Next, an embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the sanitary thin paper according to the present embodiment includes an intermediate layer 30 containing heat-fusible fibers and one outer layer in which heat-fusible fibers containing chemical fibers and pulp are mixed. The first outer layer (10) and the other outer layer (second outer layer) 20 are provided. Then, thermocompression bonding is performed by the deep emboss E1 group and the shallow emboss E2 group between them from the first outer layer 10 side. In addition, the first outer layer 10 is joined to the intermediate layer 30 in a state of being bitten into the intermediate layer 30 by the deep embossing E1 group, and a surface embossing (E2) group that does not reach the intermediate layer 30 by the shallow embossing E2 group is configured. Has been.

  The sanitary thin paper of this embodiment is excellent in water absorption and oil absorption because the first outer layer 10 contains chemical fibers and pulp. Further, since the first outer layer 10 is mixed with heat-fusible fibers in addition to chemical fibers and pulp, the occurrence of lint is small.

  The chemical fiber of this embodiment includes regenerated fiber, semi-regenerated fiber, and synthetic fiber. Although the kind of chemical fiber is not specifically limited, Rayon fiber is suitable. Rayon fiber has the characteristics of being soft, excellent in touch, and improved in water absorption because it is hydrophilic among chemical fibers. As the rayon fiber, one having a fiber thickness of 0.5 to 6.0 dtex (preferably 0.6 to 2.0 dtex) and a fiber length of 2 to 7 mm (preferably 3 to 5 mm) can be used.

As the chemical fiber, PP (polypropylene) fiber is more preferable than rayon fiber, and PET (polyethylene terephthalate) fiber is more preferable than PP fiber. When PP fiber or PET fiber is included, it becomes difficult to cause a loss of shape when moisture or oil is absorbed. In addition, since the PET fiber has lipophilicity, if it contains the PET fiber, the oil absorption is improved. In addition, it is difficult for the water and oil content once retained in the first outer layer 10 to ooze out and the water and oil retention properties. Will improve. As PP fiber and PET fiber, those having a fiber thickness of 0.1 to 5.0 dtex (preferably 0.1 to 2.0 dtex) and a fiber length of 2 to 7 mm (preferably 3 to 5 mm) can be used. .
A core-sheath composite fiber can also be used.

  As a pulp, the pulp used for normal sanitary thin paper can be used. However, it is preferable to use pure pulp containing no filler, and it is preferable to use pulp containing more NBKP (softwood bleached kraft pulp) than LBKP (hardwood bleached kraft pulp). In general, NBKP has a thicker fiber than LBKP, so that the more NBKP, the higher the bulkiness and softness, and the better the water absorption and oil absorption.

  By the way, when mixing the above-mentioned chemical fiber and pulp, since both do not hydrogen bond, it is common to combine with an adhesive. However, since sanitary thin paper may be used in contact with food or the like, for example, the use of an adhesive is not desirable. On the other hand, since the sanitary thin paper of this embodiment is bonded by the heat-fusible fiber, it does not have such a problem. Moreover, when sanitary thin paper is made into a laminated structure like this form, integration of layers can also be performed with an adhesive agent. However, the use of adhesives is not desirable as well. On the other hand, the sanitary thin paper of this embodiment does not have such a problem because it is not based on an adhesive.

  The type of the heat-fusible fiber is not particularly limited in the first outer layer 10 or the intermediate layer 30, and the resin is modified to lower the melting point or use a binder fiber with improved adhesion to the pulp. can do. Examples of the binder fibers include vinylon binder fibers, olefinic binder fibers such as PE (polyethylene) and PP (polypropylene), and polyester binder fibers. Among these, for example, vinylon binder fibers can be bonded to pulp and chemical fibers by hot water dissolution, and olefin-based and polyester-based binder fibers can be bonded to each other by heat fusion to increase strength. However, as the binder fiber, a composite binder fiber having a core-sheath structure in which a resin having a melting point lower than that of the core part is used for the sheath part is preferable. Examples of the core-sheath composite binder fiber include core / sheath = PP / PP, PP / PE, and the like. When the chemical fibers are mainly rayon fibers, it is preferable to use vinylon binder fibers in order to suitably bond the rayon fibers. The vinylon binder fiber may have a fiber thickness of 1.0 to 5.0 dtex (preferably 1.0 to 2.0 dtex) and a fiber length of 2 to 7 mm (preferably 3 to 5 mm).

The blend ratio of chemical fiber, pulp and heat-fusible fiber is 20-60 mass% (preferably 30-50 mass%) of chemical fiber, 30-80 mass% (preferably 40-60 mass%) of pulp, and heat fusion. It is 3-20 mass% (preferably 5-15 mass%) of a dressing fiber. In particular, when the pulp is 30 to 80% by mass, the basis weight (JIS P 8124: 1998) is preferably 10 to 40 g / m ² (preferably 15 to 30 g / m ² ). When the pulp is contained in a large amount of 30% by mass or more, if the basis weight is less than 10 g / m ² , the strength is weak and it is torn during wiping or the occurrence of lint is increased. On the other hand, if the basis weight exceeds 40 g / m ² , it becomes hard and loses its softness, making it difficult to wipe off.

  As described above, the sanitary thin paper of this embodiment has a laminated structure including the intermediate layer 30, the first outer layer 10, and the second outer layer 20. Therefore, the sanitary thin paper becomes bulky and is excellent in water absorption and oil absorption per unit area. In addition, the sanitary thin paper of this embodiment has a surface embossing (E2) group in which the heat-fusible fiber is mixed with the first outer layer 10 and does not reach the intermediate layer 30 by the shallow embossing E2 group. High strength and low lint generation.

  By the way, when the sanitary thin paper has a laminated structure as described above, the layers can be integrated by an airlaid method or a mechanical entanglement method (spun lace method). However, according to these methods, the rigidity of the sanitary thin paper may be excessively increased (decrease in softness) or the integrity may be insufficient. In particular, when the first outer layer 10 includes pulp as in this embodiment, the integrity tends to be insufficient. Further, the layers can be integrated by thermocompression bonding using a dryer or a thermal calendar. However, if the integrity of the layers is made sufficient by this method, the sanitary thin paper becomes thin and hard. On the other hand, if the bulkiness of the sanitary thin paper is to be improved, the integrity of the layers becomes insufficient, and lint tends to occur. On the other hand, the sanitary thin paper of this embodiment includes a heat-fusible fiber in both the intermediate layer 30 and the first outer layer 10 and is thermocompression bonded. In addition, the first outer layer 10 is partially Since it is integrated by being bitten into the intermediate layer 30 by the deep embossed E1 group, there is no possibility that the rigidity is excessively increased or the integrity is insufficient. When the intermediate layer 30 and the first outer layer 10 include heat-fusible fibers and are integrated only by thermocompression bonding, it is necessary to apply a certain amount of strong pressure, so that the rigidity is likely to increase. Occurs. Further, when the first outer layer 10 is integrated only by being bitten into the intermediate layer 30 by the deep embossing E1 group, if the number of the deep embossing E1 group is small, the integration tends to be insufficient, If the number of deep embossed E1 groups is large, there arises a problem that rigidity tends to increase. Furthermore, since the deep embossed E1 group has fewer voids and lowers the liquid absorbency, it is not preferable to increase the number.

  In this embodiment, the intermediate layer 30 includes heat-fusible fibers, but other materials are not particularly limited. For example, it may be composed of the same or similar material as the first outer layer 10 or the second outer layer 20, or may be composed of a bulky nonwoven fabric such as an air-through nonwoven fabric, a spunlace nonwoven fabric, or an airlaid nonwoven fabric containing heat-fusible fibers. it can. The effect of including the heat-fusible fiber is as described above. The reason why the heat fusible “fiber” is used instead of the heat fusible “substance in general” is to prevent a decrease in softness. However, in order to improve the softness and bulkiness of the intermediate layer 30, it is preferable to include chemical fibers, particularly crimp chemical fibers, in addition to the heat-fusible fibers.

  At this time, the intermediate layer 30 has a chemical fiber (preferably crimped chemical fiber) of 20 to 60% by mass (preferably 30 to 50% by mass), a pulp of 30 to 80% (preferably 40 to 60%), and heat fusion. It is preferable that the binder fiber as the adhesive fiber is 3 to 20% (preferably 5 to 15%).

In addition, it is preferable that the specific volume of this intermediate layer 30 (the paper thickness is measured with a Peacock manufactured by Ozaki Seisakusho and the volume per gram (cm ³ / g) is calculated) is ³ to 20 cm ³ / g. When the specific volume is less than 3 cm ³ / g, the bulk is lost, and when the specific volume is more than 20 cm ³ / g, the strength decreases, and there is a risk of tearing during wiping.

  In the present embodiment, the second outer layer 20 can also be made of a material that is completely different from that of the first outer layer 10, and can be, for example, 100% pulp. At this time, a crepe may be formed on the second outer layer 20 to increase bulkiness. This crepe can be formed by, for example, a doctor installed on a press roll in a wet part or a doctor installed on a cylinder type dryer in a dryer part. Usually, the case of the former is called “wet creping”, and the case of the latter is called “dry creping”. For example, in the case of tissue paper, dry creping is preferred. However, with wet creping, the shape of the crepe can be kept almost intact even when wet, and because the paper is stretchable and flexible, it is less likely to lose its shape when absorbing moisture and oil, making it bulky. Is also maintained.

  On the other hand, when it is desired that the sanitary thin paper of this embodiment can be used regardless of whether it is front or back, the second outer layer 20 is also composed of the first outer layer 10 in which the heat-fusible fiber is mixed with chemical fibers and pulp. It is good to comprise with the material which is the same or approximate. In this case, as shown in FIG. 3, the outer layer side of the second outer layer 20 is thermocompression bonded by the deep embossed E1 group and the shallow embossed E2 group therebetween, and the second outer layer 20 is also It is preferable that a surface embossing (E2) group that is joined to the intermediate layer 30 and that does not reach the intermediate layer 30 is formed by the shallow embossing E2 group in a state of being bitten into the intermediate layer 30 by the deep embossing E1 group. According to this form, since the 2nd outer layer 20 comes to have the same effect as the 1st outer layer 10, it becomes a sanitary thin paper which can be used regardless of the front and back.

  Further, in this embodiment, it is more preferable that the positions of the deep embossed E1 group coincide with each other between the outer layers 10 and 20 as in the illustrated example. According to this form, since the integrity of the layers is excellent in the matching deep embossed E1 group portion, the integrity of the layers on the entire surface of the sanitary thin paper is also excellent.

Here, the sanitary thin paper of this embodiment has a total basis weight (JIS P 8124: 1998) of the intermediate layer 30 and both outer layers 10 and 20 of 40 to 180 g / m ² (preferably 50 to 150 g / m ² ), It is preferable that the embossed E1 group portion is compressed by 50 to 90% (preferably 60 to 80%) and the shallow embossed E2 group portion is compressed by 10 to 30% (preferably 15 to 25%). If the compression ratio in the deep embossed E1 group portion is less than 50%, the interlayer strength (integration) becomes weak, and there is a risk of delamination. On the other hand, if the compression ratio in the deep embossed E1 group portion exceeds 90%, the heat-sealing fibers may be thermocompression-bonded to form a film, or the holes may be partially opened to reduce the strength. is there. On the other hand, if the compression ratio in the shallow embossed E2 group portion is less than 10%, the surface fibers are not heat-sealed, and the surface strength cannot be improved. On the other hand, if the compression ratio in the shallow embossed E2 group exceeds 30%, the voids are reduced and the liquid absorbency is lowered, and the softness is lost. These compression rates are the effects when the total basis weight of the intermediate layer 30 and both outer layers 10 and 20 is in the above range (40 to 180 g / m ² ). If the total basis weight is less than 40 g / m ² , there is a problem that the required water absorbency and oil absorbability cannot be obtained and the bulkiness is lowered. On the other hand, if the total basis weight exceeds 180 g / m ² , there is a problem that the softness is lowered. In the present specification, the above compression rate (%) is determined by measuring the embossing depth with a laser microscope (VK-9510, manufactured by Keyence Corporation) capable of three-dimensional measurement, and the paper thickness of the unembossed portion. It means the ratio of emboss depth to (measured with Peacock manufactured by Ozaki Seisakusho).

  In the sanitary thin paper of this embodiment, the basis weight of each layer is such that the first outer layer 10: intermediate layer 30: second outer layer 20 = 10-30: 40-80: 10-30 (preferably 15-25: 30-50: 15). ~ 25) is preferred. If it is this range, although the whole sanitary thin paper will exhibit water absorption and oil absorption, it will become difficult to produce a shape loss at the time of absorbing a water | moisture content and an oil component.

  In the sanitary thin paper of this embodiment, the area ratio of the deep embossed E1 group portion is 5 to 25% (preferably 7 to 20%), and the area ratio of the shallow embossed E2 group portion is 5 to 25% (preferably 7 to 20%). The area of the deep embossed E1 group part / the area of the shallow embossed E2 group part (hereinafter also simply referred to as “embossed area ratio”) is 0.3 to 1.2 (preferably 0.5 to 1.0). It is preferable that If the area ratio of the deep embossed E1 group portion is less than 5%, the integrity of the layers is lowered. On the other hand, when the area ratio of the deep embossed E1 group portion exceeds 25%, the softness and bulkiness are lowered. Further, when the area ratio of the shallow embossed E2 group portion is less than 5%, the surface strength is partially insufficient, and for example, it is impossible to effectively prevent the occurrence of lint from that portion. On the other hand, when the area ratio of the shallow embossed E2 group portion exceeds 25%, the entire surface of the sanitary thin paper is thermocompression bonded, so that softness and bulkiness are lowered, and touch is also lowered. Furthermore, when the area ratio of the emboss is out of the above range (0.3 to 1.2), the balance between softness and bulk and the integrity of the layers cannot be achieved.

  The total area ratio of the deep embossed E1 group portion and the shallow embossed E2 group portion is 10 to 40% (preferably 15 to 35%). When the total area ratio is less than 10%, the integrity of the layers becomes insufficient, and delamination tends to occur. If the total area ratio exceeds 30%, the softness and bulkiness may decrease, and the necessary water absorption and oil absorption may not be obtained.

  As shown in FIG. 4, the sanitary thin paper of this embodiment is embossed E1 from one side or both sides as shown in FIG. 1 or 3 in a state where the first outer layer 10, the intermediate layer 30 and the second outer layer 20 are overlapped. , E2 group, and thermocompression bonding to unify (join) the layers. If necessary, after the intermediate layer 30 and one outer layer 10, 20 are integrated, the whole can be integrated by a two-stage method in which the other outer layer 10, 20 is integrated.

  In this case, the embossing E1, E2 group application method is not particularly limited. For example, known methods and apparatuses such as a steel rubber method and a steel-steel method can be employed. When the steel rubber method is adopted, the rubber side is made of PTFE (polytetrafluoroethylene, tetrafluoroethylene resin, 4F), PCTFE (ethylene trifluoride resin), PVDF (ethylene difluoride resin), By using a material containing a fluororesin such as PFA or FEP, the rubber itself can be prevented from being melted by heat, and only a desired portion can be heat-sealed.

  In the present embodiment, it is not particularly limited whether or not the layers other than the embossed E1 and E2 group portions are thermally fused and the layers are integrated with each other. However, from the viewpoint of improving softness, it is preferable that the portions other than the embossed E1 and E2 group portions are not heat-sealed.

  In this embodiment, the planar shape (emboss pattern) of the embosses E1 and E2 is not particularly limited. The shapes of the embosses E1 and E2 can be, for example, polygons such as rectangles, squares, rhombuses, figures such as stars, flowers, and leaves. However, when the deep embossing E1 is circular or rectangular and the diameter or one side L1 is 1 to 5 mm (preferably 2 to 3 mm), the shallow embossing E2 is circular or rectangular and the diameter or one side L2 is 1 to 1. 5 mm (preferably 1.5 to 3 mm) is suitable.

  Further, the pitch P1 of the deep embosses E1, E1,... Is 5 to 20 mm (preferably 10 to 15 mm), and the pitch P2 of the shallow embosses E2, E2 is 3 to 10 mm (preferably 5 to 8 mm). (Measured with a Peacock manufactured by Ozaki Seisakusho) T1 is 80 to 300 μm (preferably 100 to 280 μm), the thickness T2 of the second outer layer 20 is 80 to 300 μm (preferably 100 to 280 μm), and the intermediate layer 30 The thickness T3 is preferably 200 to 400 μm (preferably 220 to 380 μm). In this case, the depth D of the deep emboss E1 is deeper than the thickness T1 of the first outer layer 10 but shallower than the thickness gauges (T1 + T3) of the first outer layer 10 and the intermediate layer 30, and the thickness of the sanitary thin paper. It is suitable that it is 50 to 90% (preferably 60 to 80%) of (T1 + T2 + T3). In addition, the depth of the shallow emboss E2 is preferably 20 to 60% (preferably 30 to 50%) of the thickness T1 of the first outer layer 10.

The arrangement of the embosses E1 and E2 can be irregular (random), but is preferably regular from the viewpoint of uniform effect throughout.
When embossing is applied, the embossing roll is preferably heated to 100 to 180 ° C., and a temperature at which the heat-fusible fiber is heat-sealed is required.
The nip pressure when embossing is preferably 60 to 220 kgf / cm.

Next, examples of the present invention will be described. In the following, unless otherwise specified, “part” means “part by mass” and “%” means “% by mass”.
First, using the raw materials shown in Table 1, a first outer layer, an intermediate layer, and a second outer layer were manufactured and laminated in the state shown in FIG. Next, the laminated sheet was embossed on both sides by a steel rubber method. This embossing was performed by heating the steel roll to 130 ° C. Various tests were performed on the obtained test pieces. Tables 1 and 2 show the physical properties and evaluation of the test pieces. Details regarding physical properties and evaluation methods are as follows.
(Raw materials, etc.)
“A” in the table is acrylic fiber (fiber thickness 0.1 dtex, fiber length 6 mm, Bonnell (Mitsubishi Rayon Co., Ltd.)), “B1” is PET binder fiber (fiber thickness 2.2 dtex, fiber length 5 mm, N720H) (Core-sheath structure) (manufactured by Kuraray Co., Ltd.)), “B2” is a PET binder fiber (fiber thickness 1.1 dtex, fiber length 5 mm, 4080 (core-sheath structure) (manufactured by Unitika)), “N” NBKP [Daio “C” is a PET crimp fiber (fiber thickness 2.2 dtex, fiber length 5 mm, TT04 [manufactured by Teijin)], and “F” is an air-through nonwoven fabric.
(Basis weight)
Measured based on JIS P 8124: 1998.
(thickness)
Measured with a Peacock manufactured by Ozaki Seisakusho.
(Specific volume)
From the thickness and basis weight measured as described above, the volume per 1 g (cm ³ / g) was calculated.
(Water absorption speed)
300 μL of water was placed on the test piece with a pipette, and the time until this water soaked into the test piece was measured. Judgment on whether or not soaked was by visual inspection. In wiping applications, the water absorption rate is preferably less than 10 seconds.
(Water absorption)
A test piece cut into a 10 cm square was placed on a net, and the net was floated in a container containing water. The test piece was lifted after sufficient water penetration, and the mass of the test piece after standing for 30 seconds was measured. The mass at the time of drying was subtracted from this measured mass by 100 to obtain the amount of water absorption per 1 m ² . In the wiping application, it is desirable that the water absorption is 300 g / m ² or more.
(Surface strength)
In order to evaluate the occurrence of lint, the surface strength was tested. The friction test was conducted 50 times with a Gakushin type abrasion resistance tester manufactured by Tester Sangyo. The case where no fluffing occurred was marked with ◎, the case where some fluffiness was observed but no fibers were removed, and the case where entangled fiber lumps were generated or the surface was broken was marked with ×.
(Interlayer strength)
The case where the delamination did not occur when the wiping operation was performed or the case was manually rubbed was rated as ○, and the case where the delamination occurred as x.
(soft)
A sensory test was performed. ◎ indicates that it was very soft and easy to wipe, ○ indicates that it was soft, and X indicates that it was hard.
(Overall)
The case where it was water-absorbing and oil-absorbing and soft and easy to wipe was evaluated as ◯, and the case where it was hard and difficult to wipe was evaluated as x.
(Each comparative example)
In the comparative example, unlike the examples, each layer was integrated (joined) with a heated calender roll at a crimping area ratio of 100%, with no embossing, only with deep embossing, and only with shallow embossing. Made.

  The present invention is applicable as sanitary thin paper used in kitchens such as kitchen paper, cooking paper, and kitchen towels, and sanitary thin paper such as sanitary thin paper used for wiping off dust and chemicals in tests and experiments. is there.

It is a section schematic diagram of the sanitary thin paper of this form (one side embossing form). It is the principal part enlarged view. It is a cross-sectional schematic diagram of the sanitary thin paper of this form (double-sided embossing form). It is the cross-sectional schematic diagram before the thermocompression bonding of the sanitary thin paper of this form.

Explanation of symbols

  10 ... 1st outer layer, 20 ... 2nd outer layer, 30 ... Intermediate | middle layer, E1, E2 ... Embossing.

Claims (6)

An intermediate layer containing heat-fusible fibers, one outer layer mixed with heat-fusible fibers containing chemical fibers and pulp, and the other outer layer,
Thermocompression bonding is performed by the deep embossing group from the one outer layer side and the shallow embossing group between them,
The one outer layer is
A sanitary thin paper characterized in that a surface embossed group is formed which is joined to the intermediate layer in a state of being bitten into the intermediate layer by the deep embossed group and does not reach the intermediate layer by the shallow embossed group. . An intermediate layer containing heat-fusible fibers, one outer layer containing chemical fibers and pulp and mixed with heat-fusible fibers, and another outer layer mixed with heat-fusible fibers containing chemical fibers and pulp Have
Thermocompression bonding is performed by a deep embossing group and a shallow embossing group between them from both outer layer sides,
Both outer layers are
A sanitary thin paper characterized in that a surface embossed group is formed which is joined to the intermediate layer in a state of being bitten into the intermediate layer by the deep embossed group and does not reach the intermediate layer by the shallow embossed group. .   The sanitary thin paper according to claim 2, wherein the positions of the deep embossed groups coincide between the two outer layers. Wherein both outer layers, the pulp comprises 30 to 80 wt%, and grammage (JIS P 8124: 1998) is 10 to 40 g / m ^2, claim 2 or claim 3, wherein the sanitary thin paper. The total basis weight (JIS P 8124: 1998) of the intermediate layer and both outer layers is 40 to 180 g / m ² ,
And the sanitary thin paper of any one of Claims 2-4 compressed 50-90% in the said deep embossing group part, and compressed 10-30% in the said shallow embossing group part.   The area ratio of the deep embossing group portion is 5 to 25%, the area ratio of the shallow embossing group portion is 5 to 25%, the area of the deep embossing group portion / the area of the shallow embossing group portion is 0.3 to 1. The sanitary thin paper according to any one of claims 2 to 5, which is 2.

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